stm32f407串口读取stm32f070数据，6小时后数据为恒定值

1万 · 2025-3-20 16:49

本帖最后由地瓜patch 于 2025-3-20 17:30 编辑

两者通信是应答式
出现该问题后，用另一个模块将接口数据接入pc，数据正确，该数据来自adc，实时变化，说明070发出数据正确。
407将数据做类型强制转换后，发送到pc，数据错误，为一恒定数值不变。
强制类型转换语句如下：
char cdc_rx[2];
float adc_value_float_input[N_INPUT];
float adc_value_float_output[N];
adc_value_float_input[0] = (float)((((uint16_t)cdc_rx[0])<<8)|((uint16_t)cdc_rx[1]));
adc_value_float_output[0] = adc_value_float_input[0];

有时跑十几小时正常，有时六小时出问题

1万 · 2025-3-25 09:36

本帖最后由地瓜patch 于 2025-4-9 14:10 编辑

@香水城版主，请教这个问题，是否是hal库存在的问题

终于又出现一次，这次是8小时后。用hal库函数读取串口6的数据
HAL_UART_Receive_IT(&huart6,(uint8_t *)cdc_rx,2);

仿真中cdc_rx[]的值为412，观察寄存器cdc_rx[]的值是0x019C，
观察uart6 DR寄存器0x40011404的值为00，

用串口助手从RS485上读取数据也为00

void MX_USART6_UART_Init(void)
{

  /* USER CODE BEGIN USART6_Init 0 */

  /* USER CODE END USART6_Init 0 */

  /* USER CODE BEGIN USART6_Init 1 */

  /* USER CODE END USART6_Init 1 */
  huart6.Instance = USART6;
  huart6.Init.BaudRate = 115200;
  huart6.Init.WordLength = UART_WORDLENGTH_8B;
  huart6.Init.StopBits = UART_STOPBITS_1;
  huart6.Init.Parity = UART_PARITY_NONE;
  huart6.Init.Mode = UART_MODE_TX_RX;
  huart6.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart6.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart6) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN USART6_Init 2 */

  /* USER CODE END USART6_Init 2 */

}

else if(uartHandle->Instance==USART6)
  {
  /* USER CODE BEGIN USART6_MspInit 0 */

  /* USER CODE END USART6_MspInit 0 */
/* USART6 clock enable */
__HAL_RCC_USART6_CLK_ENABLE();

__HAL_RCC_GPIOC_CLK_ENABLE();
/**USART6 GPIO Configuration
PC6    ------> USART6_TX
PC7    ------> USART6_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_USART6;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

/* USART6 DMA Init */
/* USART6_RX Init */
hdma_usart6_rx.Instance = DMA2_Stream1;
hdma_usart6_rx.Init.Channel = DMA_CHANNEL_5;
hdma_usart6_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart6_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart6_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart6_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart6_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart6_rx.Init.Mode = DMA_NORMAL;
hdma_usart6_rx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart6_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart6_rx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart6_rx);

/* USART6_TX Init */
hdma_usart6_tx.Instance = DMA2_Stream6;
hdma_usart6_tx.Init.Channel = DMA_CHANNEL_5;
hdma_usart6_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart6_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart6_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart6_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart6_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart6_tx.Init.Mode = DMA_NORMAL;
hdma_usart6_tx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart6_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart6_tx) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(uartHandle,hdmatx,hdma_usart6_tx);

/* USART6 interrupt Init */
HAL_NVIC_SetPriority(USART6_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(USART6_IRQn);
  /* USER CODE BEGIN USART6_MspInit 1 */

  /* USER CODE END USART6_MspInit 1 */
  }